https://en.wikipedia.org/wiki/Who%27...Peer_Review%3F
These kinds of things don't really demonstrate that critical theory or peer review journals are non-reliable, but it does illustrate that there are failings and weaknesses in a system that relies on a handful of people to be the arbiters of quality scholarship. With the Sokal paper, someone didn't understand what they read but thought it was interesting, however this wouldn't be evidence that the larger community of scholars in critical theory would have accepted the nonsense paper. Just like open access science papers accepting a flawed paper on biochemistry is not evidence that all biochemical papers published in those journals are nonsense.